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Re: idl array operations [message #47768 is a reply to message #47767]

Tue, 28 February 2006 15:26

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

alex922@gmail.com wrote:
> Hi,
>
> I'm pretty new to IDL and someone told me to avoid loops.
>
> I have the following problem. I have an array of elements whose values
> range from 0 to 360, and I have to subtract a number if the value is
> greater than 180.
>
> My initial reaction is to create a loop and use condition statements to
> perform the calculations.
>
> Is there a 'one liner' array operation which would allow me to do this
> without using loops?

Dunno about a one-liner:

loc=where(data gt 180.0,count)
if (count gt 0) then data[loc]=data[loc]-number

There's probably a solution via HISTOGRAM, too. :o)

paulv

--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC

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[Message index]

		Re: idl array operations By: alex922@gmail.com on Wed, 01 March 2006 14:44
		Re: idl array operations By: Craig Markwardt on Tue, 28 February 2006 22:50
		Re: idl array operations By: mmeron on Tue, 28 February 2006 15:34
		Re: idl array operations By: alex922@gmail.com on Tue, 28 February 2006 15:27
		Re: idl array operations By: Paul Van Delst[1] on Tue, 28 February 2006 15:26

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